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TransformersTEMCo
offers highest quality custom transformers fast!
5-day turn around on most models. Call our Transformer
Manufacturer Specialists with your specs. We will
give you a quote and get your custom transformer
order started today!
510-490-2187.

Variac

TEMCo caries a wider range of models, brands and
types of variac and offers them a great low wholesale prices.

Call Our Variac Specialists Today!

TEMCo has experience handling and understanding a
wide range of variac applications and can assist you in choosing a make
and model to bet fit your need. Call our variac specialists today
at 510-490-2187 for assistance in choosing
the correct model to meet your need.

About Variac Use and Common Application

Variac, or
variable voltage transformers, are not widely known or understood,
but are fairly common throughout industry. Variacs are used to provide
a voltage-adjustable source of AC electricity. Usually they are plugged
into a wall outlet, and have a knob-controlled output that can range
from 0 volts to about 140 VAC, depending on how the winding is
connected. Variacs do not provide isolation from the wall outlet
so they are not usually suitable for directly powering low-voltage
devices on their own. Common variac applications are
tube audio for powering experimental circuits and for equipment testing
and repair, and are not usually used as a permanent source of voltage
-shifted power.

Common Variac Applications

Electronic service departments
us a variac to check out equipment with low and high operating
voltages.

Engineering departments use
variacs to check designs and assure new products operate with expected
input power variations.

Variacs are used in engineering
and industrial high current generator control

Quality control testing, a
variac is used to test electronic equipment for burn-in and life-tests

Industrial motor speed control

Types Of Variac

There are two of the most
common types of variac that are typically seen, the bench models
and the open frame types. The bench model contains the winding in
a ventilated metal shield, with the control knob on top. The variac
sits on the bench top like a soda can sits on a counter top. It has an
on/off switch, a fuse, one or more AC outlets, a line cord and
sometimes a current or voltage meter. The open frame types are intended
for panel mounting in equipment racks or as a part of some larger piece
of equipment. Electrical connections and the inductor are
exposed, but the operating principles are the same. Variacs are
designed for a specific input voltage and frequency, and will not work
well with other inputs. Only the output is intended to be variable.

How a Variac Works

Variacs work as tapped
inductors, where the "tap" is a conductive slider that moves along the
length of the inductor. The inductor is shaped like a doughnut, or
toroidal transformer with wire wrapped through the center hole and
around the toroid. A single layer of enameled covered magnet wire is
tightly wound upon the core. Each end of the winding is securely
fastened and the entire winding is lacquered locking the winding to the
core. The slider is an arm equipped with a carbon contact that rotates
on an axle located through the doughnut hole or the axis of the toroid,
The enamel insulation of the winding wire is removed where the carbon
contact touches the winding, so that the contact forms a circuit
through part of the windings.

Variacs divide
voltage by dividing the impedance between the inputs into two parts.
The fraction of the divided input impedance connected to the output
determines the output voltage. Using a variac, almost all the
power consumed is delivered to the load connected to the output. With
a variac there is some heating due to the resistance of the winding
wire, and the magnetic coupling between the input and output is far
from being perfect. But a variac is much more efficient than
one might expect

Call TEMCo - Your Variac Specialists

*Custom
Variac Transformer Voltage Combinations Available*

Contact our team at
TEMCo
Transformer at
510-490-2187 to get your quote, place your order and arrange
for shipping.

We Supply A Wide Variety
of High Quality Power Variac Transformer
Models

TEMCo has experience manufacturing electrical
products since 1968. TEMCo is a
transformer manufacturer supplier you can trust - a member of the
Better Business Bureau.We use the latest proven technology to spec manufacture
high quality industrial grade transformers and other
electrical products. All our products are built to last
using the highest quality standards using only the highest
quality supplies. As a result, TEMCo electrical products
have a long operational life, lasting many years under
proper use.All models are backed by
our quality warranty, offering heavy duty quality at a great
price.

Ordering
is as easy as1, 2,
3.

2.We
Accept Visa, Discover
American Express, Master Card.

3.We'll
ship your order to
you asap.

or

We
also accept Wire Transfer, Money Orders, etc.

And
by other professional trucking companies.

RFQ and Order Fax:
(510)
490-1507We appreciate feedback, send us email us at info@temcotransformer.com
please include a phone # to reach you.

TEMCo US + International Phone #:
1-510-490-2187
TEMCo US Only Phone #: 1-800-613-2290

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ManufacturerDistribution is currently looking for
new resellers.
If you are a qualified reseller, call for a TEMCo Transformer
reseller application.